(Mashable) -- After a running start, Google+'s growth may be slowing down a bit. A report from Experian Hitwise found both traffic and users' average time on the social network fell last week in the U.S.

Total visits to Google+ declined about 3% to 1.79 million in the U.S. for the week ending July 23 compared to the previous seven days, according to the research company.

The site received 1.86 million visits the prior week. Average time on the site was down 10%, from 5 minutes, 50 seconds to 5 minutes, 15 seconds.

Matt Tatham, a rep for Experian Hitwise, was careful not to overplay the findings. "This is not a huge drop," he says. The company extrapolates its figures from data from ISPs and from an opt-in panel of about 2.5 million users.

The report comes after Google+'s traffic enjoyed a steady climb since its June 28 debut. Last week, comScore reported that the network hit 20 million unique visitors.